On polyphagy of the fir sawyer beetle Monochamus urussovi (Coleoptera, Cerambycidae)

The possibility of Monochamus urussovi Fisch to pass through all stages of development on aspen (Populus tremula L.) and birch (Betula pubescens L.) t rees, apart from conifers, was shown. The aspen was registered as a host pl ant of this beetle for the first time. The ability to develop on aspen and birch is supposed to develop as an adaptation to successions in the course of which the native coniferous forests are replaced with secondary deciduou s ones.